/Engine/Source/Editor/EditorFramework/Public/Subsystems/EditorElementSubsystem.h
Return a normalized selection set like the editor would use for the gizmo manipulations
static FTypedElementListRef GetEditorNormalizedSelectionSet ( const [UTypedElementSelectionSet](API\Runtime\TypedElementRuntime\Elements\Framework\UTypedElementSelectionSet) & SelectionSet )